Develop Reference

Center ImageView inside another ImageView in Android

Well I have to fit one ImageView inside another one. It is smaller and has to be exactly at the center. I have both images scaled for different screen resolutions but I can test only on one phone and I am wondering if I set the second image's height and width with dpi to fit my screen resolution will it be perfectly matched on all screens or is there any property in Android aside from setting the height and width that will automatically center one ImageView inside of other ImageView?
Edit: It's in RelativeLayout and the ImageViews are at the top left so I haven't added anything specific to the because they by default are there.
Edit2: Well changing the first ImageView to be RelativeLayout helps center the second image inside of it but then the RelativeLayout grows too big and enlarges the image that is background. Is there a way to make the RelativeLayout be as big as its background?

try this
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="250dp"
android:layout_height="250dp" >
<ImageView
android:id="#+id/base"
android:layout_height="250dp"
android:layout_width="250dp"
android:src="#drawable/home"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
<ImageView
android:id="#+id/center"
android:layout_height="150dp"
android:layout_width="150dp"
android:src="#drawable/home"
android:layout_centerInParent="true"
android:layout_centerVertical="true" />
</RelativeLayout>
</RelativeLayout>

You cannot put an imageView inside another. Hope the following code will be helpful for you.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background_image"
android:gravity="center" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/image_on_center" />
</LinearLayout>

Use RelativeLayout and then use android:layout_centerInParent="true" remember the order you add the ImageViews will decide what is on top :)

Try this:
android:layout_gravity="center"

LinearLayout ImageView Resize All Image Widths To Fit

I have a horizontal linear layout that contains 3 image views. Each image view contains the same image which is 200x200 pixels. Here is my layout xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/image200" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/image200" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/image200" />
</LinearLayout>
</RelativeLayout>
And here is what it looks like:
Notice how the third image from the left is resized I assume because there is not enough real estate to contain 3x 200 pixel wide images.
What I would rather happen is instead of shrinking only the last image, all three images are resized evenly so that they all fit across the screen. How do I setup my layout to evenly fit all three images?
Thank you
UPDATE - after changing my settings here is what things look like:
Notice that the border around the image view is still 200 px high. Why is this happening?

Set Width and height to match_parent for imageviews and set layout_weight=1 for all imageviews. Also set Attribute android:scaleType="fitXY"

This worked perfectly for me:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:adjustViewBounds="true"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<ImageView
android:adjustViewBounds="true"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<ImageView
android:adjustViewBounds="true"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
</LinearLayout>
Layout width when set to 0dp, layout width is what came into picture. And here layout width of the LinearLayout is match parent. So it will take the whole width, and as per the layout width of the images, they take space in the ratio of there weight.

make your three images a width of 0dp
and add them a layout_weight of 1
;)
<ImageView
android:id="#+id/imageView1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/image200" />

#JanTacci Regarding your follow up question "Note, however, that even though the image has been shrunk the actual layout height is still 200 px. Why is this happening?"
I just had the same issue and fixed it by adding this property to each ImageView:
android:adjustViewBounds="true"

RelativeLayout ignores second ImageView?

I have the following XML layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mainLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical">
<ImageView
android:id="#+id/IVLEFT"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:background="#ff0000"
android:padding="1dp"
/>
<ImageView
android:id="#+id/IVRIGHT"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_toRightOf="#+id/IVLEFT"
android:layout_alignParentRight="true"
android:layout_alignBottom="#+id/IVLEFT"
android:layout_alignTop="#+id/IVLEFT"
android:src="#drawable/shadow_pages"
android:background="#00ff00"
android:padding="1dp" />
</RelativeLayout>
I would expect my layout to have 2 ImageViews - one to the left, one to the right.
But what actually happens is:
During runtime I set IVLEFT's image to a large image (say 1024X768) - and it covers all of my layout, abandoning IVRIGHT (I cant even see it)
Any ideas?

It is because your RelativeLayout is wrap_content in width. it takes all the space it needs even if it is outside the screen.
Use fill_parent instead.

Its because you have given first ImageView width and height to fill_parent. So it will acquire the whole layout. Then also, your layout depends on your first image, because if you give a large image to the first Imageview, it will take the whole layout.
If you want to show 2 images side by side, try using linearlayout with layout_weights to two imageViews.
Also give your RelativeLayout width and height to fill_parent

Change the RelativeLayout width to fill_parent
There is no ImageView with the id = "#+id/magazineImageView" in your xml, if you mean "#+id/IVLEFT", then the 1st image itself is occupying the whole Screen width, hence you cannot see the 2nd image.
If you want to see the 2nd image make both the ImageView width as wrap_content or some hard coded value
More importantly when you are using any View id as a reference dont use + sign in the id. + sign is used to define an id for a view, for the first time
use:
android:layout_toRightOf="#id/magazineImageView"

Try this::
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mainLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical">
<ImageView
android:id="#+id/IVLEFT"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:background="#ff0000"
android:padding="1dp"
android:src="#drawable/ic_launcher"/>
<ImageView
android:id="#+id/IVRIGHT"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/IVLEFT"
android:layout_alignParentRight="true"
android:layout_alignBottom="#+id/IVLEFT"
android:layout_alignTop="#+id/IVLEFT"
android:src="#drawable/ic_launcher"
android:background="#00ff00"
android:padding="1dp" />
</RelativeLayout>

android, imageviews inside linear layout don't fit the screen size

I was wondering how to make the four images inside my LinearLayout look as big as possible depending on the screen. When I install the widget in my phone, it always fits only 50% of the screen.
Here comes the xml.
Any hints?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_gravity="center_vertical|clip_horizontal"
android:orientation="horizontal" >
<ImageView
android:id="#+id/hora1_current"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:src="#drawable/neutro_on" />
<ImageView
android:id="#+id/hora2_current"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:src="#drawable/neutro_on" />
<ImageView
android:id="#+id/minuto1_current"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:src="#drawable/neutro_on" />
<ImageView
android:id="#+id/minuto2_current"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:src="#drawable/neutro_on" />

Add android:weightSum="1" to your parent linear layout.
The linear layout should have android:orientation="horizontal"
Now to each of your image views , add android:layout_weight = 0.25.
Hope this works.

hope you read enough about orientation vertical and horizontal .
you should clear here that by filling screen whether you mean altogether all 4 fills the screen such that each takes 25% or every one should take 100% width and added up vertically .
for first case add android:layout_weight=1 for every imageView .
for second case replace android:orientation="horizontal" by android:orientation="vertical" in root LinerLayout

Don't use wrap content, instead use the actual dimensions of the image or fill parent.

android layout scale along with content imageView's

I have a relative layout and in that I have 4 imageViews stacked one on the top of another.
I have a set of layout like this, where I have a Linear Layout and a Relative layout on one on top of another.
<LinearLayout android:layout_width="fill_parent" android:layout_height="0dip" android:layout_weight="1.0" android:background="#5500FF00"
android:orientation="vertical" android:gravity="center_horizontal|bottom" android:paddingBottom="3dip">
<include layout="#layout/app_tax_coin_subsection"/>
</LinearLayout>
In the linear layout I am including another relative layout from another xml file which has a number of boxes on top of one another..
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="#+id/app_income_coin_id"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="#drawable/box_red"
android:id="#+id/box1" android:layout_centerHorizontal="true" android:layout_alignParentBottom="true" android:visibility="visible"/>
<ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="#drawable/box_red"
android:layout_above="#id/box1" android:layout_centerHorizontal="true" android:id="#+id/box2" android:visibility="visible"/>
<ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="#drawable/box_red"
android:layout_above="#id/box2" android:layout_centerHorizontal="true" android:id="#+id/box3" android:visibility="visible"/>
<ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="#drawable/box_red"
android:layout_above="#id/box3" android:layout_centerHorizontal="true" android:id="#+id/box4" android:visibility="visible"/>
</RelativeLayout>
The above code working correctly and I am getting 4 lovely red boxes one on top of another. Now I want to reduce the size and width of the relative layout and I want these boxes to reduce size as well. In short what can I do to make the content imageView to resize(even to a size smaller than the original image size) along with its parent layout?

The layout height and width of the RelativeLayout are FILL_PARENT so they will take up the full screen. You can start by setting an absolute height/width in dps, the ImageViews will scale down to fit the parent.